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Add resize-pane -Z to temporary zoom the active pane to occupy the full
window or unzoom (restored to the normal layout) if it already zoomed,
bound to C-b z by default. The pane is unzoomed on pretty much any
excuse whatsoever.

We considered making this a new layout but the requirements are quite
different from layouts so decided it is better as a special case. Each
current layout cell is saved, a temporary one-cell layout generated and
all except the active pane set to NULL.

Prompted by suggestions and scripts from several. Thanks to Aaron Jensen
and Thiago Padilha for testing an earlier version.

/* $OpenBSD: cmd-respawn-window.c,v 1.18 2013/03/24 09:57:59 nicm Exp $ */

/*
 * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Respawn a window (restart the command). Kill existing if -k given.
 */

enum cmd_retval	 cmd_respawn_window_exec(struct cmd *, struct cmd_q *);

const struct cmd_entry cmd_respawn_window_entry = {
	"respawn-window", "respawnw",
	"kt:", 0, 1,
	"[-k] " CMD_TARGET_WINDOW_USAGE " [command]",
	0,
	NULL,
	NULL,
	cmd_respawn_window_exec
};

enum cmd_retval
cmd_respawn_window_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct winlink		*wl;
	struct window		*w;
	struct window_pane	*wp;
	struct session		*s;
	struct environ		 env;
	const char		*cmd;
	char		 	*cause;

	if ((wl = cmd_find_window(cmdq, args_get(args, 't'), &s)) == NULL)
		return (CMD_RETURN_ERROR);
	w = wl->window;

	if (!args_has(self->args, 'k')) {
		TAILQ_FOREACH(wp, &w->panes, entry) {
			if (wp->fd == -1)
				continue;
			cmdq_error(cmdq,
			    "window still active: %s:%d", s->name, wl->idx);
			return (CMD_RETURN_ERROR);
		}
	}

	environ_init(&env);
	environ_copy(&global_environ, &env);
	environ_copy(&s->environ, &env);
	server_fill_environ(s, &env);

	wp = TAILQ_FIRST(&w->panes);
	TAILQ_REMOVE(&w->panes, wp, entry);
	layout_free(w);
	window_destroy_panes(w);
	TAILQ_INSERT_HEAD(&w->panes, wp, entry);
	window_pane_resize(wp, w->sx, w->sy);
	if (args->argc != 0)
		cmd = args->argv[0];
	else
		cmd = NULL;
	if (window_pane_spawn(wp, cmd, NULL, NULL, &env, s->tio, &cause) != 0) {
		cmdq_error(cmdq, "respawn window failed: %s", cause);
		free(cause);
		environ_free(&env);
		server_destroy_pane(wp);
		return (CMD_RETURN_ERROR);
	}
	layout_init(w, wp);
	window_pane_reset_mode(wp);
	screen_reinit(&wp->base);
	input_init(wp);
	window_set_active_pane(w, wp);

	recalculate_sizes();
	server_redraw_window(w);

	environ_free(&env);
	return (CMD_RETURN_NORMAL);
}